Construction of cocks for hydraulic and pneumatic purposes



UNITED STATES PATENT @EFTCEc JOHN LEE CHAPMAN, OF BALTIMORE, MARYLAND.

CONSTRUCTION OF COCKS FOR HYDRAULIC AND PNEUMATIC PURPOSES.

Specification of Letters Patent No. 2,304, dated October 11, 1841.

To all whom @'25 may concern:

Be it known that- I, J oHN LEE CHAPMAN, of the city of Baltimore, in theState of Maryland, have invented a new and improved manner ofconstructing cocks for hydraulic and pneumatic purposes, and which isspecially adapted to use in the apparatus employed with aerated watersand wherever the pressure of gases is concerned, and l do hereby declarethat the following is a full and exact description thereof.

The accompanying drawing is a sectional view along the middle of theccck.

A, A, is the aperture for the passage of fluids; B, the key, or handle,by the turning` of which the aperture is to be opened or closed.

C, is a plug which is made conical at its lower end e, a, and iscylindrical in the part b, l). This plug ts into a chamber in the bodyof the cock, prepared to receive it. The plug is represented as raisedin the drawing, in which situation it would allow a fluid to pass alongthe aperture A., A, but were the plug forced down, the conical part a,a, would etfectually close the opening A, A, it not only being wellfitted to the conical aperture c, c, in the body of the cock, but being,also, covered with leather, or other elastic or yielding materialadapted to the nature of the fluid to be drawn. The cylindrical part 5,Y), of the plug C, fits into and moves up and down in, a cylindricalcavity (Z, (Z, in the head of the cock; and this part, also, is coveredwith leather, or other elastic packing, by means of which it is renderedair and water-tight, and yet works up and down with facility, in themanner of a piston. The key B, swivels in the head of the cock, a collare, e, being received in a recess formed for that purpose. A screw D, onthe lower end of the key is tapped into the plug C, and by turning thekey, said plug may be made to be raised or lowered. The upper end f, f,of the plug is made square, the part ,7, g, of the head forming a squaresocket adapted to it; z, 7L, is a washer of leather, or other suitablematerial, embraced between the two portions of the head which screwtogether at e', and which may be unscrewed for the purpose of renewingthe packing on the plug. The head is also screwed together at j, j, forthe purpose of admitting the collar e,

Having thus fully described the manner in which l construct my hydraulicand pneumatic cock, and combine the resp ctive parts thereof with eachother, what I claim therein as new, and desire to secure by Let.- tersPatent, is-q 1. The manner cf forming the plug C, and the chamber withinwhich it operates; the lower part of said plug being made conical, andadapted to the closing of the passage of fluids through the cock, andthe upper portion thereof being cylindrical, and so packed as to berendered air and water tight, substantially in the manner, and for thepurpose, herein described.

2. And l do hereby declare that although I have represented anddescribed the particular manner in which l put the respective parts ofthe instrument together, and which l consider to be the best arrangementthereof, l do not intend to limit or confine myself to this precisemode, but to vary the same as I may think proper, while the parts uponwhich the secure action of the cock is dependent are combined, andoperate, substantially as set forth.

JOHN LEE CHAPMAN. litnesses Trios. P. JONES, PETER Hoes.

